<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>页面加载事件</title>
    <script>
      // 页面加载事件
      window.onload = function () {
        console.log("页面加载完毕");
        let boxEle = document.getElementById("box");
        console.log(boxEle);
      };
    </script>
  </head>
  <body>
    <div id="box">hello</div>
  </body>
</html>
